This documentation page is for Quform version 1 and may not be applicable for Quform 2 click here to visit the documentation for Quform 2.
Allowed file extensions
File Upload → Settings → Optional
The element will not accept any file extensions other than those added here. Enter the extensions separated by commas and without the dot, for example:
jpg, png, gif
If left blank, all file extensions are allowed (this is NOT recommended for security reasons, as malicious users could upload and execute a PHP script for example).